You have read many times that it is necessary to eat foods rich in fiber, but did you know that they can be soluble and insoluble?
Solvents dissolve in the fluids in the digestive system and form a gelatinous mass. They reduce fat absorption and help regulate weight. By increasing the volume, they give a feeling of satiety, which results in less intake of other foods.
The foods that are richest in soluble fiber are peas, green beans, oats, apples and citrus fruits.

Insolubles, on the other hand, pass almost intact as they pass through the digestive system. They can not be absorbed by the body, but with their properties they help cleanse the intestines of intestinal sediment.
These include whose seeds, flax, almonds, dark chocolate, oatmeal, buckwheat, raspberries, avocados, beets, broccoli, carrots, bananas and green beans.
Fiber-rich foods should be part of your weekly menu, preferably daily, in reasonable quantities.